hx-boost attribute

• includes an HX-Boosted Header12ms ‣

  this.server.respondWith('GET', '/test', function(xhr) {
    should.equal(xhr.requestHeaders['HX-Boosted'], 'true')
    xhr.respond(200, {}, 'Boosted!')
  })
  var btn = make('<a hx-boost="true" hx-target="this" href="/test">Click Me!</a>')
  btn.click()
  this.server.respond()
  btn.innerHTML.should.equal('Boosted!')